Good cheap 383 builds??

There's not really too much you can do on a low budget deal. No piston will give you decent compression with open chambered heads without some careful blueprinting of block decks and head milling. You can toss in some KB domed pistons but you'll still struggle to get 9:1 static out of that combo with the big chamber heads. So I'd plan on a mild cam (summit brand smaller cam would be good), some basic single performance valve springs, and run it as is until the budget allows for more.